GitVersion: Bug: Branch contains / is not replaced by - in build metadata

GitVersion version: 4.0, 3.6.4 Problem: Given a branch name contains /, e.g. hotfixes/build-script, the build metadata does not convert it to hyphen. This is not a valid semver 2.

{
  "Major":0,
  "Minor":2,
  "Patch":1,
  "PreReleaseTag":"beta.1",
  "PreReleaseTagWithDash":"-beta.1",
  "PreReleaseLabel":"beta",
  "PreReleaseNumber":1,
  "BuildMetaData":11,
  "BuildMetaDataPadded":"0011",
  "FullBuildMetaData":"11.Branch.hotfixes/build-script.Sha.301ff2de375da97133ab544c9561cbd909039877",
  "MajorMinorPatch":"0.2.1",
  "SemVer":"0.2.1-beta.1",
  "LegacySemVer":"0.2.1-beta1",
  "LegacySemVerPadded":"0.2.1-beta0001",
  "AssemblySemVer":"0.2.1.1",
  "FullSemVer":"0.2.1-beta.1+11",
  "InformationalVersion":"0.2.1-beta.1+11.Branch.hotfixes/build-script.Sha.301ff2de375da97133ab544c9561cbd909039877",
  "BranchName":"hotfixes/build-script",
  "Sha":"301ff2de375da97133ab544c9561cbd909039877",
  "NuGetVersionV2":"0.2.1-beta0001",
  "NuGetVersion":"0.2.1-beta0001",
  "CommitsSinceVersionSource":11,
  "CommitsSinceVersionSourcePadded":"0011",
  "CommitDate":"2018-10-31"
}